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> That's like saying "How we built a Smart Office system based on Electricity"

I'm of the same opinion. But the Pis come with HDMI and audio-out which is convenient to plug TVs and speakers to. At least for the TV outputs, one could use ChromeCast, but you'd have to figure out a solution for multiple audio outputs. Would a single beefy Linux PC support several USB audio outputs?

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As an experiment, I set up the four outputs of my computer to play a different audio stream simultaneously. Each one took about 1% cpu usage. Next I played 5 videos simultaneously, streamed from a hard disk drive. I only used two monitors there, but that was about 4% CPU usage per video. My computer is admittedly kinda beefy, but I have no doubts that a slower computer wouldn't have trouble with the task.

You could also use a multi-channel USB sound card, so you would have 5 independent audio output sources per USB device.

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